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<head><meta charset="utf-8"><title>pre-meeting triage 2019-04-25 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html">pre-meeting triage 2019-04-25 #54818</a></h3>

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<a name="164167683"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164167683" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164167683">(Apr 25 2019 at 13:02)</a>:</h4>
<p>Ok, lets start this. We have a number (14) of nominated issues.</p>



<a name="164167766"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164167766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164167766">(Apr 25 2019 at 13:03)</a>:</h4>
<p><strong>  ICE while bootstrapping (./x.py build) <a href="https://github.com/rust-lang/rust/issues/2" target="_blank" title="https://github.com/rust-lang/rust/issues/2"><a href="https://github.com/rust-lang/rust/issues/2" target="_blank" title="https://github.com/rust-lang/rust/issues/2">#2</a></a> <a href="https://github.com/rust-lang/rust/issues/60228" target="_blank" title="https://github.com/rust-lang/rust/issues/60228"><a href="https://github.com/rust-lang/rust/issues/60228" target="_blank" title="https://github.com/rust-lang/rust/issues/60228">#60228</a></a> </strong></p>
<p>This is a metadata ICE. My fingers itch to make this a P-high, but need to find somebody to investigate it.</p>



<a name="164167856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164167856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164167856">(Apr 25 2019 at 13:04)</a>:</h4>
<p>Very plausible that this will not be easily reproducible and will likely fix itself for the reporter if they started a clean build as well.</p>



<a name="164168004"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168004" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168004">(Apr 25 2019 at 13:06)</a>:</h4>
<p><strong> ICE on higher-trait bounds <a href="https://github.com/rust-lang/rust/issues/60218" target="_blank" title="https://github.com/rust-lang/rust/issues/60218"><a href="https://github.com/rust-lang/rust/issues/60218" target="_blank" title="https://github.com/rust-lang/rust/issues/60218">#60218</a></a> </strong></p>
<p>Bisected, <span class="user-mention" data-user-id="116009">@nikomatsakis</span>’s universes PR got blamed. It has been a while since it landed, which suggests people do not encounter this often. Still P-high?</p>



<a name="164168135"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168135" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168135">(Apr 25 2019 at 13:08)</a>:</h4>
<p><strong>  Async fns that take structs with elided lifetime parameters are broken. <a href="https://github.com/rust-lang/rust/issues/60203" target="_blank" title="https://github.com/rust-lang/rust/issues/60203"><a href="https://github.com/rust-lang/rust/issues/60203" target="_blank" title="https://github.com/rust-lang/rust/issues/60203">#60203</a></a> </strong></p>
<p>Reading <span class="user-mention" data-user-id="127859">@Taylor Cramer</span>’s comment it seems like the current behaviour is expected? It seems like this was nominated for T-lang either way, so leaving it be.</p>



<a name="164168316"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168316" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168316">(Apr 25 2019 at 13:10)</a>:</h4>
<p><strong> cannot borrow as mutable because it is also borrowed as immutable (likely regression) <a href="https://github.com/rust-lang/rust/issues/60136" target="_blank" title="https://github.com/rust-lang/rust/issues/60136"><a href="https://github.com/rust-lang/rust/issues/60136" target="_blank" title="https://github.com/rust-lang/rust/issues/60136">#60136</a></a> </strong></p>
<p>P-high, as it is a regression to beta. Should fix within a month or so. Any takers?</p>



<a name="164168463"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168463" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168463">(Apr 25 2019 at 13:13)</a>:</h4>
<p><strong>  error: internal compiler error: unexpected region in query response: <code>ReScope(Destruction(219))</code> <a href="https://github.com/rust-lang/rust/issues/60127" target="_blank" title="https://github.com/rust-lang/rust/issues/60127"><a href="https://github.com/rust-lang/rust/issues/60127" target="_blank" title="https://github.com/rust-lang/rust/issues/60127">#60127</a></a> </strong></p>
<p>Another ICE, another P-high? Needs an assignee to investigate.</p>



<a name="164168610"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168610" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168610">(Apr 25 2019 at 13:15)</a>:</h4>
<p><strong>  -Clinker-plugin-lto doesn't work without extra manual work <a href="https://github.com/rust-lang/rust/issues/60059" target="_blank" title="https://github.com/rust-lang/rust/issues/60059"><a href="https://github.com/rust-lang/rust/issues/60059" target="_blank" title="https://github.com/rust-lang/rust/issues/60059">#60059</a></a> </strong></p>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> nominated this for an actual discussion, will return to it later</p>



<a name="164168773"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168773" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168773">(Apr 25 2019 at 13:17)</a>:</h4>
<p><strong>  rustc incorrectly warn #[no_mangle] is not used when doing incremental build <a href="https://github.com/rust-lang/rust/issues/60050" target="_blank" title="https://github.com/rust-lang/rust/issues/60050"><a href="https://github.com/rust-lang/rust/issues/60050" target="_blank" title="https://github.com/rust-lang/rust/issues/60050">#60050</a></a>  </strong></p>
<p>P-…medium, perhaps? Would be nice to see it fixed to have rock-stable incremental, but also does not block anything.</p>



<a name="164168904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164168904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164168904">(Apr 25 2019 at 13:19)</a>:</h4>
<p><strong>  Rust 1.34 generates significantly less debug information for libstd functions vs. Rust 1.33 <a href="https://github.com/rust-lang/rust/issues/60020" target="_blank" title="https://github.com/rust-lang/rust/issues/60020"><a href="https://github.com/rust-lang/rust/issues/60020" target="_blank" title="https://github.com/rust-lang/rust/issues/60020">#60020</a></a>  </strong></p>
<p>No changes since the last time. IIRC last time we complained this is providing descriptions of the behaviour but not a reproducer. On those grounds will skip this this week as well.</p>



<a name="164169033"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169033" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169033">(Apr 25 2019 at 13:21)</a>:</h4>
<p><strong>  Change powerpc64 base CPU <a href="https://github.com/rust-lang/rust/issues/59932" target="_blank" title="https://github.com/rust-lang/rust/issues/59932"><a href="https://github.com/rust-lang/rust/issues/59932" target="_blank" title="https://github.com/rust-lang/rust/issues/59932">#59932</a></a> </strong></p>
<p>Seems like this just needs discussion from stakelholders in PPC support, none of which (other than me, I guess) anybody on T-compiler are? Inclined to denominate.</p>



<a name="164169413"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169413" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169413">(Apr 25 2019 at 13:25)</a>:</h4>
<p><strong>  Decouple nightly RLS from Clippy <a href="https://github.com/rust-lang/rust/issues/59761" target="_blank" title="https://github.com/rust-lang/rust/issues/59761"><a href="https://github.com/rust-lang/rust/issues/59761" target="_blank" title="https://github.com/rust-lang/rust/issues/59761">#59761</a></a> </strong> </p>
<p>Skipping, as it appears to be mostly <code>T-dev-tools</code> thing.</p>



<a name="164169606"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169606" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169606">(Apr 25 2019 at 13:28)</a>:</h4>
<p><strong>  reached the type-length limit while instantiating <a href="https://github.com/rust-lang/rust/issues/58952" target="_blank" title="https://github.com/rust-lang/rust/issues/58952"><a href="https://github.com/rust-lang/rust/issues/58952" target="_blank" title="https://github.com/rust-lang/rust/issues/58952">#58952</a></a>  </strong></p>
<p>Regression caused by changes to stdlib. Just like with recursion limit and stack limit in compiler… it seems like this is an inherent limitation in the compiler that we cannot resolve easily/quickly.</p>



<a name="164169612"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169612" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169612">(Apr 25 2019 at 13:28)</a>:</h4>
<p>Inclined to just skip.</p>



<a name="164169648"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169648" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169648">(Apr 25 2019 at 13:29)</a>:</h4>
<p><strong>  mir-opt tests extremely slow. <a href="https://github.com/rust-lang/rust/issues/58485" target="_blank" title="https://github.com/rust-lang/rust/issues/58485"><a href="https://github.com/rust-lang/rust/issues/58485" target="_blank" title="https://github.com/rust-lang/rust/issues/58485">#58485</a></a> </strong></p>
<p>They <em>are</em> slow, but what is the exact source of slowness?</p>



<a name="164169731"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169731" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169731">(Apr 25 2019 at 13:30)</a>:</h4>
<p><strong>  x.py in incremental mode still rebuilds stage0-rustc if stage0-std changed. <a href="https://github.com/rust-lang/rust/issues/54712" target="_blank" title="https://github.com/rust-lang/rust/issues/54712"><a href="https://github.com/rust-lang/rust/issues/54712" target="_blank" title="https://github.com/rust-lang/rust/issues/54712">#54712</a></a>  </strong></p>
<p>Nominated for resource allocation, so will return to it during the proper meeting.</p>



<a name="164169810"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169810" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169810">(Apr 25 2019 at 13:31)</a>:</h4>
<p><strong>  Exponential compile-time and type_length_limit blowup when nesting closure wrappers <a href="https://github.com/rust-lang/rust/issues/54540" target="_blank" title="https://github.com/rust-lang/rust/issues/54540"><a href="https://github.com/rust-lang/rust/issues/54540" target="_blank" title="https://github.com/rust-lang/rust/issues/54540">#54540</a></a>  </strong></p>
<p>Seems to be the same as <strong> reached the type-length limit while instantiating <a href="https://github.com/rust-lang/rust/issues/58952" target="_blank" title="https://github.com/rust-lang/rust/issues/58952"><a href="https://github.com/rust-lang/rust/issues/58952" target="_blank" title="https://github.com/rust-lang/rust/issues/58952">#58952</a></a> </strong> from before.</p>



<a name="164169992"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164169992" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164169992">(Apr 25 2019 at 13:33)</a>:</h4>
<p>The regressions have been looked at as part of inspection of the <code>I-nominated</code> issues.</p>



<a name="164172000"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-04-25%20%2354818/near/164172000" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-04-25.20.2354818.html#164172000">(Apr 25 2019 at 13:55)</a>:</h4>
<blockquote>
<p><strong> ICE on higher-trait bounds <a href="https://github.com/rust-lang/rust/issues/60218" target="_blank" title="https://github.com/rust-lang/rust/issues/60218"><a href="https://github.com/rust-lang/rust/issues/60218" target="_blank" title="https://github.com/rust-lang/rust/issues/60218">#60218</a></a> </strong></p>
<p>Bisected, <span class="user-mention silent" data-user-id="116009">nikomatsakis</span>’s universes PR got blamed. It has been a while since it landed, which suggests people do not encounter this often. Still P-high?</p>
</blockquote>
<p>Seems P-high to me. Presently it's just nominated. I guess I will try to investigate tomorrow, let's assign to me for now.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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